Angular父子组件通过服务传参的示例方法

import { Injectable } from \'@angular/core\';
import { Subject } from \'rxjs/Subject\';
@Injectable()
export class SharedService {
 // Observable string sources
 private emitChangeSource = new Subject<any>();
 // Observable string streams
 changeEmitted$ = this.emitChangeSource.asObservable();
 // Service message commands
 emitChange(change: any) {
 this.emitChangeSource.next(change);
 }
}

import { Component} from \'@angular/core\';
@Component({
 templateUrl: \'child.html\',
 styleUrls: [\'child.scss\']
})
export class ChildComponent {
 constructor(
 private _sharedService: SharedService
 ) { }
 (){
 this._sharedService.emitChange(\'Data from child\');
 }
}

import { Component} from \'@angular/core\';
@Component({
 templateUrl: \'parent.html\',
 styleUrls: [\'parent.scss\']
})
export class ParentComponent {
 constructor(
 private _sharedService: SharedService
 ) {
 _sharedService.changeEmitted$.subscribe(
 text => {
 console.log(text);
 });
 }
}